Date: Thu, 15 Apr 2010 20:07:50

Author: Pati Sievert

Subject: Re: query about Lenz's Law equipment

Post:

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I've got a strip of this magnetic viewing film on a 1m long, thick-walled
copper pipe. The viewing film is not very durable*, but I've used a wide
strip of packing tape to hold it on the pipe which is close to 2" OD. It
has held up well (over 5 years) and students can "watch" the magnet fall
from quite a distance.
*The pieces of magnetic viewing film I purchased at the same time as the
strip that I allowed the public to handle have all been ruined.
Pati

On Thu, Apr 15, 2010 at 12:48 PM, Paul Doherty wrote:

> Educational Innovations wraps some magnetic viewing paper around the tube
> so you can see the magnetic field of the falling magnet
>
>
> http://www.teachersource.com/ElectricityAndMagnetism/EddyCurrentsAndMagneticFields/MagneticFieldViewerFilm.aspx
>
> Paul D
>
>
>
> On Apr 15, 2010, at 10:32 AM, Jerry DiMarco wrote:
>
> I vaguely remember a picture of a clear tube with wire coils wrapped
>> around the outside. The coil ends may have been connected to LEDs. But I
>> can't remember where it was, and couldn't find it just now...
>>
>>
>> Jerry
>>
>>
>> At 4/15/2010 12:03 PM, you wrote:
>>
>>> Is there a variation on the Lenz's law demo that allows the eddy currents
>>> to be "seen"? That is, a string of LEDs light up along the way as the
>>> magnet falls? I could swear I saw something like this at a conference.
>>>
>>
>>
>> <><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
>>
>> Jerry DiMarco
>> Manager of Lecture Demonstrations and Instructional Labs
>> Montana State Univ., Physics Dept.
>>
>> Bozeman, MT
>>
>> Our Motto: "Find your inner demo."
>>
>>
>


--
Pati Sievert
STEM Outreach Coordinator
Science, Technology, Engineering, & Math
Northern Illinois University
DeKalb, IL 60115
815-753-1201

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I've got a strip of this magnetic viewing film on a 1m long, thick-wall=
ed copper pipe.=A0 The viewing film is not very durable*, but I've used=
a wide strip of packing tape to hold it on the pipe which is close to 2&qu=
ot; OD.=A0 It has held up well (over 5 years) and students can "watch&=
quot; the magnet fall from quite a distance.
*The pieces of magnetic viewing film I purchased at the same time as the st=
rip that I allowed the public to handle have all been ruined.=A0 PatiOn Thu, Apr 15, 2010 at 12:48 PM, Paul Doh=
erty @gmail.com> wrote:
Educational Innov=
ations wraps some magnetic viewing paper around the tube =A0so you can see =
the magnetic field of the falling magnet


http://w=
ww.teachersource.com/ElectricityAndMagnetism/EddyCurrentsAndMagneticFields/=
MagneticFieldViewerFilm.aspx


Paul D


On Apr 15, 2010, at 10:32 AM, Jerry DiMarco wrote:


=A0 =A0 I vaguely remember a picture of a clear tube with wire coils wrapp=
ed around the outside. =A0The coil ends may have been connected to LEDs. =
=A0But I can't remember where it was, and couldn't find it just now=
...


=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0Jerry


At 4/15/2010 12:03 PM, you wrote:

Is there a variation on the Lenz's law demo that allows the eddy curren=
ts to be "seen"? =A0That is, a string of LEDs light up along the =
way as the magnet falls? =A0I could swear I saw something like this at a co=
nference.




<><><><><><><><><><=
;><><><><><><><><><&g=
t;<><><><><><><><><>&=
lt;>


=A0Jerry DiMarco
=A0Manager of Lecture Demonstrations and Instructional Labs
=A0Montana State Univ., Physics Dept. =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0
=A0Bozeman, MT

Our Motto: "Find your inner demo."



-- Pati Siever=
tSTEM Outreach CoordinatorScience, Technology, Engineering, & M=
athNorthern Illinois UniversityDeKalb, IL =A060115815-753-1201<=
br>


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From tap-l-owner@lists.ncsu.edu Thu Apr 15 22:30:20 2010

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